Detection device and image forming device
First Claim
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1. A detection device for detecting an electromagnetic wave, comprising:
- a dielectric portion on which an electromagnetic wave is incident, wherein the electromagnetic wave includes at least a part of a frequency region from 30 GHz to 30 THz;
a film located under the dielectric portion in a direction of the incident electromagnetic wave, wherein the film has a dielectric constant with a negative real part with respect to an electromagnetic wave having a frequency in the frequency region; and
an electromagnetic wave detection portion located under the film in the direction of the incident electromagnetic wave, wherein the electromagnetic wave detection portion is constructed to detect an electromagnetic wave having a frequency in the frequency region,wherein an absolute value of the real part of the dielectric constant of the film is larger than a dielectric constant of the electromagnetic wave detection portion, a dielectric constant of the dielectric portion is larger than the dielectric constant of the electromagnetic wave detection portion, and a distance between the film and the electromagnetic wave detection portion is not more than a wavelength of an electromagnetic wave having a frequency in the frequency region.
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Abstract
There is a need for a detection device which has high photoreceptive sensitivity in a generally wide frequency region including the infrared region. Therefore, in the present invention, by utilizing a phenomenon in which electric field strength is enhanced by surface plasmon resonance in a negative dielectric constant medium, a detection device is provided which has an electromagnetic wave detection portion disposed at a position where the electric field strength is large.
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Citations
11 Claims
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1. A detection device for detecting an electromagnetic wave, comprising:
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a dielectric portion on which an electromagnetic wave is incident, wherein the electromagnetic wave includes at least a part of a frequency region from 30 GHz to 30 THz; a film located under the dielectric portion in a direction of the incident electromagnetic wave, wherein the film has a dielectric constant with a negative real part with respect to an electromagnetic wave having a frequency in the frequency region; and an electromagnetic wave detection portion located under the film in the direction of the incident electromagnetic wave, wherein the electromagnetic wave detection portion is constructed to detect an electromagnetic wave having a frequency in the frequency region, wherein an absolute value of the real part of the dielectric constant of the film is larger than a dielectric constant of the electromagnetic wave detection portion, a dielectric constant of the dielectric portion is larger than the dielectric constant of the electromagnetic wave detection portion, and a distance between the film and the electromagnetic wave detection portion is not more than a wavelength of an electromagnetic wave having a frequency in the frequency region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A detection device for detecting an electromagnetic wave, comprising:
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a filter portion for selecting a wavelength region of an electromagnetic wave to be detected, wherein the electromagnetic wave to be detected includes at least a part of a frequency region from 30 GHz to 30THz, and wherein the filter portion has a grating shape with a period which is not more than a wavelength of the electromagnetic wave to be detected and comprises a negative dielectric constant medium having a dielectric constant with a negative real part; and an electromagnetic wave detection portion, wherein the electromagnetic wave detection portion is exposed in a recess of the grating shape.
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10. A detection device for detecting an electromagnetic wave, comprising:
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a dielectric portion on which an electromagnetic wave is incident, wherein the electromagnetic wave includes at least a part of a frequency region from 30 GHz to 30 THz; a film located under the dielectric portion in a direction of the incident electromagnetic wave; and an electromagnetic wave detection portion located under the film in the direction of the incident electromagnetic wave, wherein the electromagnetic wave detection portion is constructed to detect an electromagnetic wave having a frequency in the frequency region, wherein a real part of a dielectric constant of the film is negative with respect to an electromagnetic wave having a frequency in the frequency region, an absolute value of the real part of the dielectric constant of the film is larger than a dielectric constant of the electromagnetic wave detection portion, and a dielectric constant of the dielectric portion is larger than the dielectric constant of the electromagnetic wave detection portion, whereby a surface plasmon resonance is caused between the film and the electromagnetic wave detection portion, and wherein a distance between the film and the electromagnetic wave detection portion is not more than a wavelength of an electromagnetic wave having a frequency in the frequency region.
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11. A detection device for detecting an electromagnetic wave, comprising:
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a film on which an electromagnetic wave is incident, wherein the electromagnetic wave includes at least a part of a frequency region from 30 GHz to 30 THz, wherein the film has a grating shape with a period which is not more than a wavelength of an electromagnetic wave having a frequency in the frequency region, and wherein the film has a dielectric constant with a negative real part with respect to an electromagnetic wave having a frequency in the frequency region; and an electromagnetic wave detection portion located under the film in a direction of the incident electromagnetic wave, wherein the electromagnetic wave detection portion is constructed to detect an electromagnetic wave having a frequency in the frequency region, wherein an absolute value of the real part of the dielectric constant of the film is larger than a dielectric constant of the electromagnetic wave detection portion, and the electromagnetic wave detection portion is exposed in a recess of the grating shape.
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Specification